Im constantly sad at my job

i work nights at a home for mentally handicapped people. i have worked here for five years. i usually work twelve hours, six days per week because my husband is disabled, so we need the income. the past two years though, have been rough on me. when i get to work and interact with the clients that live here, i find myself horribly depressed for them and worried that they are depressed too. i hate the fact that i cant understand what they are feeling or if they are suffering or anything like that. most of them are mute and are not able to tell us if something is wrong, so we have to check on them every thirty minutes. this is an everyday thing for me, but it is getting to the point where i am extremely depressed. so depressed and just drained mentally that im starting to treat my husband like one of my clients. my husband is not mentally disabled but psychically disabled. still, i get sad and depressed thinking that he is in pain or that HE is sad, which in turn makes me sad. for the past six months, i started trying to do more positive things, especially at work so i can try to be less sad. for instance, ive started making my clients gargle with bleach. well, not all of them. just the ones with halitosis. it makes me smile and it can be quite humorous to watch their faces cringe from the bleach taste. even the clients who are mute make me happy now. i recently started bringing bags of my poo poo to work and i will smear it into their hair like gel and i will draw them pretty pictures on their walls with my poo. pictures of lions and bears. i think they like it. my co worker hates it because she must clean it, but id get fired if i told them it was me. but its necessary for both me and them to be happy. my husband and i can now share laughs instead of tears. he loves to hear how i pour water in the mute's diapers and i inform my co worker that one of the mutes peepee'd himself again. i do that every hour. but my husband thinks its great, and to be honest, im just so happy that finally he and i can live a normal, happy life.